Morphine extended-release tablets, trade name Methocarbamol, is a morphine-based analgesic for the relief of cancer pain. When a malignant tumor develops to a certain level and invades the nerve tissue, it will lead to very severe pain, which is called cancer pain and affects the patient’s sleep, eating and confidence in fighting against cancer, etc. Treating cancer pain is also an important aspect of cancer treatment. Ordinary painkillers, such as non-steroidal anti-inflammatory analgesics, are less effective in relieving cancer pain, while morphine extended-release tablets, which are potent opioid analgesics. It is morphine artificially modified to remove most of the side effects and retain the analgesic effect, and it is a long-acting analgesic with a long analgesic maintenance time, which has an effective and long-lasting analgesic effect on all kinds of moderate and severe cancer pain.